KINGSTON — The Kitsap County Sheriff’s Department took two students into custody at Kingston High School on Sept. 9 for alleged felony harassment and intimidating a witness in relation to the case involving school-threat suspect Matthew Allen Smiley.

A third student was arrested at the high school for a single charge of intimidating a witness.

There will be a sheriff’s presence on the school’s campus for the next few days, Superintendent Patty Page said. Deputies will be at the school to add a comfort level, not because there are more threats, Page said.

The three students, all Kingston High School students who will not be named, were arrested at the school between 12:30-1:30 p.m.

A fourth person was arrested in Bremerton. He is a 19-year-old transient and registered sex offender who is known to frequent the North Kitsap area, according to sheriff’s spokesman Deputy Scott Wilson.

All four people were arrested for allegedly making threats to harm witnesses in connection with the investigation into Smiley’s alleged threats against Kingston High School, according to the Kitsap County Sheriff’s Office. Smiley was arrested and charged in District Court on Sept. 8 with felony harassment for making threats to “shoot up” the high school.

The juveniles are from Indianola, Poulsbo and Kingston. They were booked into the Kitsap County Youth Services Center, the sheriff’s office reported.

An email to parents to inform them of the investigation was sent at 2:40 p.m. Sept. 9 by Chris Willits, assistant superintendent of the North Kitsap School District.

District officials notified sheriff’s detectives about alleged threats to witnesses in the school-threat case. Threats to harm several individuals were allegedly made via social media, the sheriff’s office reported.

The alleged threats ranged from “significant harm” to killing, Wilson said.

The district is always assessing how it handles security at its schools and looking at ways to strengthen security, Page said. She said the district has a good relationship with the sheriff’s department and Poulsbo Police Department.

The district recently joined in the Olympic Education Service District 114 School Safety and Security Cooperative, which addresses issues to prepare the district and schools to prevent, prepare for, and respond to school safety and security issues.

“What we currently have is working,” Page said.